令x=-x则有3f(-x)+2f(x)=-2x+2解方程组3f(x)+2f(-x)=2x+2，3f(-x)+2f(x)=-2x+2得，f(x)=2x+0.4
3f(x)+2f(-x)=2x+2， ①3f(-x)+2f(x)=-2x+2 ②①x3-②x2得f(x）=2x+0.4 望采纳！
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